Chlorinated vinyl chloride-based resin and manufacturing method
AssigneesSekisui Chemical Co., Ltd., Tokuyama Sekisui Co., Ltd.
InventorsToshifumi Sanni, Hideaki Tanaka, Masatoshi Harada
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Abstract
An object of the present invention is to provide a chlorinated vinyl chloride-based resin with few unstable structures and excellent thermal stability, and a molding article. The chlorinated vinyl chloride-based resin of the invention is an resin in which a chlorine content is 65 wt % or higher, and less than 69 wt %, —CCl2— is in an amount of 6.2 mol % or less, —CHCl— is in an amount of 58.0 mol % or higher, and —CH2— is in an amount of 35.8 mol % or less contained in a molecular structure.
Claims23
1-17. (canceled)
A chlorinated vinyl chloride-based resin in which
- a chlorine content is 65 wt % or higher, and less than 69 wt %,
- —CCl2— is in an amount of 6.2 mol % or less,
- —CHCl— is in an amount of 58.0 mol % or higher, and
- —CH2— is in an amount of 35.8 mol % or less contained in a molecular structure.
A chlorinated vinyl chloride-based resin in which
- a chlorine content is 69 wt % or higher, and less than 72 wt %,
- —CCl2— is in an amount of 17.0 mol % or less,
- —CHCl— is in an amount of 46.0 mol % or higher, and
- —CH2— is in an amount of 37.0 mol % or less contained in a molecular structure.
A method for manufacturing a chlorinated vinyl chloride-based resin comprising dispersing a vinyl chloride-based resin in an aqueous medium inside a sealable reaction vessel, reducing a pressure in the reaction vessel, introducing chlorine into the vessel to chlorinate the vinyl chloride-based resin, the method comprising
- controlling a chlorine consumption rate which is the amount of chlorine consumed in 5 minutes per kilogram of raw material vinyl chloride-based resin so that the chlorine consumption rate is in the range of 0.010 and 0.020 kg/PVC-kg·5 min at the point of reaching 5 wt % away from the final chlorine content of the chlorinated vinyl chloride-based resin, and so that the chlorine consumption rate is in the range of 0.005 and 0.015 kg/PVC-kg·5 min at the point of reaching 3 wt % away from the final chlorine content.
Dependencies are inferred from the claim text.